So I know there have been countless posts on the ML320 trunk actuator, and I've read most of them, but I have still been unable to fix my problem. I replaced the actuator AND the hatch latch (which turned out not to be necessary I guess), and still the key fob and the electronic locking mechanism doesn't lock the trunk. The trunk locks manually, but that's about it. Does anyone have any advice? I was thinking I could replace a relay, but since it is only the trunk and all other doors work fine, I wasn't sure.